Sheriff Mark Curran says investigators are questioning the driver of a Ford Super-Duty pickup truck that T-boned a Lincoln Continental driven by Scott Shirey Monday night as he tried to make a turn at the intersection of Route 12 and Old McHenry Road.

Shirey's twin sons, Griffin and Nicholas, were in the backseat and sustained grave injuries.

Griffin died at Good Shepard Hospital. Nicholas was taken by helicopter to Lutheran General Hospital where he is listed in critical condition.

Curran said all parties involved in the crash have submitted to DUI testing and the pickup driver has given a urine sample. Contrary to earlier reports, Curran said there was no evidence of drug or alcohol use found at the scene of the crash.

Curran acknowledged that the intersection has a history of high-profile crashes including the 2009 death of a Lake Zurich motorcyclist who was killed by a distracted driver who was applying nail polish at the time of the collision.

A memorial fund has been set up for the boys with Fifth-Third Bank in Island Lake called: "The Memorial Account for the Benefit of Griffin and Nicholas Shirey."